1. Department of Thyroid Surgery, Zhengzhou University First Affiliated Hospital of Zhengzhou, Zhengzhou, Henan 450000, P.R. China
2. Department of General Surgery, Zhongshan Hospital, Xiamen University, Xiamen, Fujian 361004, P.R. China
3. Department of General Surgery, Zhongshan Hospital, Xiamen University, Xiamen, Fujian 361004, P.R. China
4. Department of Plastic Surgery, Zhongshan Hospital, Xiamen University, Xiamen, Fujian 361004, P.R. China